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1. Introduction
Gridded SuperDARN data consists of median filtered, geo-magnetically located ionospheric scatter, fitted to an equi-area grid. Within IDL three structures are used to store the gridded data.
2. Grid parameters data structure GridPrm
prm={GridPrm, stme: $
{GridTime,yr:0, $ ; start year
mo:0, $ ; start month
dy:0, $ ; start day
hr:0, $ ; start hour
mt:0, $ ; start minute
sc:0D}, $ ; start second
etme: $
{GridTime,yr:0, $ ; end year
mo:0, $ ; end month
dy:0, $ ; end day
hr:0, $ ; end hour
mt:0, $ ; end minute
sc:0D}, $ ; end second
stnum: 0L, $ ; number of contributing stations
vcnum: 0L, $ ; number of vectors
xtd:0 $ ; extended format flag
}
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3. Grid station information data structure GridSVec
stvec={GridSVec,st_id:0, $ ; station identifier
chn:0, $ ; channel number
npnt:0, $ ; number of vectors
freq:0.0, $ ; operating frequency
major_revision:0, $ ; major revision
minor_revision:0, $ ; minor revision
prog_id: 0, $ ; program identifier
gsct: 0, $ ; ground scatter flag
noise: {GridNoise,mean:0.0, $ ; noise mean
sd:0.0}, $ ; noise standard deviation
vel: {GridLimit,min:0.0, $ ; velocity threshold minimum
max:0.0}, $ ; veloctiy threshold maximum
pwr: {GridLimit,min:0.0, $ ; power threshold minimum
max:0.0}, $ ; power threshold maximum
wdt: {GridLimit,min:0.0, $ ; spectral width threshold minimum
max:0.0}, $ ; spectral width threshold maximum
verr: {GridLimit,min:0.0, $ ; velocity error threshold minimum
max:0.0} $ ; velocity error threshold maximum
}
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4. Grid vectors data structure GridGVec
gvec={GridGVec, mlat:0.0, $ ; magnetic latitude
mlon:0.0, $ ; magnetic longitude
azm: 0.0, $ ; magnetic azimuth
vel: {GridValue,median:0.0, $ ; velocity mean
sd:0.0}, $ ; velocity standard deviation
pwr: {GridValue,median:0.0, $ ; power mean
sd:0.0}, $ ; power standard deviation
wdt: {GridValue,median:0.0, $ ; spectral width mean
sd:0.0}, $ ; spectral width standard deviation
st_id: 0, $ ; station identifier
chn: 0, $ ; channel number
index: 0L $ ; grid index
}
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